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A Comprehensive Thermal and Structural Transient Analysis of a Boiler’s Steam Outlet Header by Means of a Dedicated Algorithm and FEM Simulation

Author

Listed:
  • Marcin Pilarczyk

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology–NTNU, 7491 Trondheim, Norway)

  • Bohdan Węglowski

    (Department of Energy, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Kraków, Poland)

  • Lars O. Nord

    (Department of Energy and Process Engineering, Norwegian University of Science and Technology–NTNU, 7491 Trondheim, Norway)

Abstract

Increasing the share of renewables in energy markets influences the daily operation of thermal power units. High capacity power units are more frequently operated to balance power grids and, thus, steam boilers are exposed to unfavorable transient states. The aim of this work was to perform thermal and structural analyses of a boiler’s outlet steam header, with a capacity of 650?10 3 kg/h (180 kg/s) of live steam. Based on the measured steam pressure and temperatures on the outer surface of the component, transient temperature fields were determined by means of an algorithm that allows determination of transient stress distributions on the internal and external surfaces, as well as at stress concentration regions. In parallel, a finite element method simulation was performed. A comparison of the obtained results to a finite element analysis showed satisfactory agreement. The analyses showed that the start-up time could be reduced because the total stress did not exceed the allowed values during the regular start-up of the analyzed power unit. The algorithm was efficient and easy to implement in the real control systems of the power units. The numerical approach employed in the presented algorithm also allowed for determination of the time- and place-dependent heating rate value, which can be used as input data for the control system of the power unit.

Suggested Citation

  • Marcin Pilarczyk & Bohdan Węglowski & Lars O. Nord, 2019. "A Comprehensive Thermal and Structural Transient Analysis of a Boiler’s Steam Outlet Header by Means of a Dedicated Algorithm and FEM Simulation," Energies, MDPI, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:gam:jeners:v:13:y:2019:i:1:p:111-:d:301743
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    References listed on IDEAS

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    2. Taler, Jan & Węglowski, Bohdan & Taler, Dawid & Sobota, Tomasz & Dzierwa, Piotr & Trojan, Marcin & Madejski, Paweł & Pilarczyk, Marcin, 2015. "Determination of start-up curves for a boiler with natural circulation based on the analysis of stress distribution in critical pressure components," Energy, Elsevier, vol. 92(P1), pages 153-159.
    3. Ferruzza, Davide & Kærn, Martin Ryhl & Haglind, Fredrik, 2019. "Design of header and coil steam generators for concentrating solar power applications accounting for low-cycle fatigue requirements," Applied Energy, Elsevier, vol. 236(C), pages 793-803.
    4. Taler, Jan & Zima, Wiesław & Ocłoń, Paweł & Grądziel, Sławomir & Taler, Dawid & Cebula, Artur & Jaremkiewicz, Magdalena & Korzeń, Anna & Cisek, Piotr & Kaczmarski, Karol & Majewski, Karol, 2019. "Mathematical model of a supercritical power boiler for simulating rapid changes in boiler thermal loading," Energy, Elsevier, vol. 175(C), pages 580-592.
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